# List of the Paleozoic life of Indiana

This list of the Paleozoic life of Indiana contains the various prehistoric life-forms whose fossilized remains have been reported from within the US state of Indiana and are between 538.8 and 252.17 million years of age.

## A

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* †Abatocrinus
** †Abatocrinus grandis
* Fossilized calyx of the Carboniferous crinoid ("sea lily") Abrotocrinus †Abrotocrinus
** †Abrotocrinus coreyi
** †Abrotocrinus nodosus
** †Abrotocrinus unicus
* †Acacocrinus
** †Acacocrinus americanus
* †Acanthopecten
** †Acanthopecten procarboniferous
* †Achistrum
** †Achistrum brevis – type locality for species
** †Achistrum ludwigi
** †Achistrum nicholsoni
** †Achistrum triassicum
* †Achradocrinus
* †Acidaspis
* †Acinophyllum
** †Acinophyllum davisi – type locality for species
* †Acratia
** †Acratia similaris
* †Acrocrinus
** †Acrocrinus constrictus
* † Acrophyllum
** †Acrophyllum ellipticum
** †Acrophyllum oneidaense
** †Acrophyllum rugosum
* Fossilized calyx and partial stem of the Devonian-Permian crinoid ("sea lily") Actinocrinites †Actinocrinites
** †Actinocrinites gibsoni
** †Actinocrinites grandissimus
** †Actinocrinites lobatus – tentative report
** †Actinocrinites lowei
* †Actinopteria
** †Actinopteria boydi
* †Actinostroma
* †Adinocrinus
** †Adinocrinus nodosus
* †Aemuliophyllum
** †Aemuliophyllum exiguum
* †Aganaster
** †Aganaster gregarius
* †Agaricocrinites
* †Agaricocrinus
** Fossilized calyx of the Carboniferous crinoid ("sea lily") Agaricocrinus americanus, or the mushroom crinoid †Agaricocrinus americanus
* †Agassizocrinus
** †Agassizocrinus gibbosus – or unidentified comparable form
** †Agassizocrinus laevis – or unidentified comparable form
* †Ageneracrinus
** †Ageneracrinus basalotumidus
* †Ahrensisporites
** †Ahrensisporites guerickei
* †Aipoceras – tentative report
* †Alaskadiscus
** †Alaskadiscus magnus
* †Alatisporites
** †Alatisporites trialatus
* Fossilized fronds of the Carboniferous-Early Cretaceous seed fern Alethopteris †Alethopteris
** †Alethopteris davreuxi
** †Alethopteris decurrens
** †Alethopteris grandini
** †Alethopteris lonchitica
** †Alethopteris owenii
** †Alethopteris serlii
* †Alisocrinus
** †Alisocrinus aureatus
** †Alisocrinus caleyi
** †Alisocrinus laevis
* †Allocrinus
** †Allocrinus benedicti
* †Allocystites
** †Allocystites hammeli
* †Alloprosallocrinus
** †Alloprosallocrinus conicus
* †Allorhynchus
** †Allorhynchus curriei
* †Alveolites
** †Alveolites asperus
** †Alveolites constans
** †Alveolites dispansus
** †Alveolites expatiatus
** †Alveolites goldfussi
** †Alveolites minimus
** †Alveolites mordax
** †Alveolites squamosus
** †Alveolites winchellana
* †Amaurotoma
** †Amaurotoma leavenworthana – type locality for species
** †Amaurotoma subangulatum – type locality for species
* †Ambocoelia
* †Ambonychia
** †Ambonychia obesa
** †Ambonychia robusta
** †Ambonychia suberecta
* Ammobaculites
** †Ammobaculites leptos
** †Ammobaculites pyriformis
* Ammodiscus
** †Ammodiscus longexsertus
* †Ammonellipsites
* †Ammovertella
** †Ammovertella inclusa
* †Ampheristocystis
** †Ampheristocystis concentricus
* †Amphipora
* †Amphipsalidocrinus – type locality for genus
** †Amphipsalidocrinus inconsuetus
** †Amphipsalidocrinus scissurus – type locality for species
* †Amphissites
** †Amphissites similaris
* †Amphistrophia
* †Amphoracrinus
* †Amplexiphyllum
** †Amplexiphyllum cruciforme
** †Amplexiphyllum simplex – tentative report
** †Amplexiphyllum tenue
* †Amplexizaphrentis
** †Amplexizaphrentis spinulosus
* Ordovician-Permian bryozoan Amplexopora †Amplexopora
** †Amplexopora discoidea – or unidentified comparable form
* †Amplexus
* †Anachoropteris
** †Anachoropteris involuta
* †Anapiculatisporites
** †Anapiculatisporites baccatus
** †Anapiculatisporites spinosus
* †Anartiocystis
* †Anastrophia
** †Anastrophia internascens
* †Anchiopsis
* †Ancyrocrinus
** †Ancyrocrinus bulbosus
* †Anematina
** †Anematina proutana – type locality for species
* †Angustidontus
** †Angustidontus seriatus
* †Angyomphalus
** †Angyomphalus northviewensis – or unidentified related form
* †Anisocrinus
** †Anisocrinus laurelensis
* †Anisotrypa
** †Anisotrypa solida
* †Ankyropteris
** †Ankyropteris brongnartii
* Fossil of the Carboniferous horsetail relative Annularia †Annularia
** †Annularia mucronata
** †Annularia radiata
** †Annularia sphenophylloides
** †Annularia stellata
* †Anomalodonta
** †Anomalodonta gigantea
* †Anopliopsis
** †Anopliopsis subcarinata
* †Anthracospirifer
** †Anthracospirifer leidyi
* †Antirhynchonella
* †Aphelakardia
** †Aphelakardia indianense
* †Aphelecrinus
** †Aphelecrinus oweni
** †Aphelecrinus randolphensis
* †Aphelotoxon
* †Aphlebia
** †Aphlebia crispa
* †Apiculatasporites
** †Apiculatasporites latigranifer
* †Apiculatisporites
** †Apiculatisporites abditus
** †Apiculatisporites lappites
** †Apiculatisporites setulosus
* †Arabellites
** †Arabellites comis
** †Arabellites conspicuous – or unidentified comparable form
** †Arabellites cultriformis – or unidentified comparable form
** †Arabellites hamiltonesis
* †Arachnophyllum
** †Arachnophyllum striatum – or unidentified comparable form
* †Archaeopitys
** †Archaeopitys eastmanii
* Fossils of the Carboniferous-Permian bryozoan Archimedes †Archimedes
** †Archimedes communis
** †Archimedes compactus
** †Archimedes distans
** †Archimedes intermedius
** †Archimedes invaginatus
** †Archimedes lativolvis
** †Archimedes macfarlani
** †Archimedes meekanoides
** †Archimedes meekanus
** †Archimedes negligens – or unidentified comparable form
** †Archimedes proutanus
** †Archimedes swallovanus
** †Archimedes swallowvanus
** †Archimedes symmetricus
** †Archimedes terebriformis
* †Archinacella
** †Archinacella indianensis – type locality for species
* Fossil of the Silurian trilobite Arctinurus †Arctinurus
** †Arctinurus boltoni
* †Arjamannia
** †Arjamannia aulangonensis
* †Armenoceras
** †Armenoceras madisonense
* †Arnoldella
** †Arnoldella minuta
* †Arthroacantha
** †Arthroacantha carpenteri
* †Arthropitys
** †Arthropitys communis
* †Artisia
* †Asaphocrinus
** †Asaphocrinus minor
* †Ascoceras
** †Ascoceras newberryi
** †Ascoceras wabashense
* †Ascodictyon
* †Ascopora
* †Aspidiaria
* †Asterophyllites
** †Asterophyllites equisetiformis
** †Asterophyllites grandis
* †Asterotheca
** †Asterotheca crenulata
** †Asterotheca cyathea
** †Asterotheca hemitelliodes
** †Asterotheca miltoni
** †Asterotheca oreopteridia
* Life restoration of the Early Devonian club moss relative Asteroxylon †Asteroxylon
** †Asteroxylon setchelli
* †Astraeospongium
* †Astylospongia
** †Astylospongia praemorsa
* †Atactoporella
* †Atelodictyon
* †Athyris
** †Athyris fultonensis
** †Athyris lamellosa
** †Athyris parvirostra
** †Athyris spiriferoides
* †Atrypa
** †Atrypa newsomensis
** †Atrypa parva – or unidentified comparable form
** †Atrypa reticularis
** †Atrypa reticularus
* †Atrypina
** †Atrypina disparilis
* †Aulacophyllum
** †Aulacophyllum mutabile
** †Aulacophyllum parvum
** †Aulacophyllum perlamellosum
** †Aulacophyllum pinnatum
** †Aulacophyllum sulcatum
* †Aulacotheca
* †Aulocystis
** †Aulocystis auloporidea
** †Aulocystis incrustans – tentative report
** †Aulocystis jacksoni
** †Aulocystis lucasensis
** †Aulocystis nobilis
** †Aulocystis procumbens – tentative report
** †Aulocystis transitorius – type locality for species
* Fossil of the Late Ordovician-Permian tabulate coral Aulopora †Aulopora
** †Aulopora edithana
** †Aulopora microbuccinata
** †Aulopora tubiporoides
* †Auloporella
* †Aviculopecten
** †Aviculopecten colletti
** †Aviculopecten invalidus
** †Aviculopecten spinuliferus
** †Aviculopecten terminalis
* † Avonia – tentative report
* † Avonia

## B

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* Bairdia
** †Bairdia compacta
** †Bairdia egorovi – or unidentified related form
** †Bairdia kinderhookensis – or unidentified related form
* †Barroisella
** †Barroisella campbelli
* †Barycrinus
** †Barycrinus asperrimus
** †Barycrinus asteriscus
** †Barycrinus cornutus
** †Barycrinus hoveyi
** †Barycrinus stenobrachium
* †Baryschyr
** †Baryschyr anosus
* †Batocrinus
** †Batocrinus grandis
** †Batocrinus isodactylus
* †Batostoma
** †Batostoma prosseri
** †Batostoma varians
* †Batostomella
* †Beatricea
** †Beatricea undulata
* †Beecheria
** †Beecheria illinoisense
** †Beecheria shumardanum – tentative report
** †Beecheria sinuata
* †Belemnospongia
** †Belemnospongia fascicularis
** †Belemnospongia parmula
* Fossilized shell of the Silurian-Early Triassic mollusc Bellerophon †Bellerophon
** †Bellerophon gibsoni – type locality for species
** †Bellerophon jeffersonensis
** †Bellerophon spergensis – type locality for species
* †Belodella
** †Belodella resima – or unidentified comparable form
* †Beloitoceras
** †Beloitoceras amoenum – type locality for species
** †Beloitoceras bucheri
** †Beloitoceras chapparsi
** †Beloitoceras cumingsi
** †Beloitoceras ohioense
** †Beloitoceras transiens
* †Bembexia
** †Bembexia minima
* Berenicea
* †Bethacanthus – type locality for genus
** †Bethacanthus insolitus – type locality for species
* †Bethanyphyllum
** †Bethanyphyllum arctifossa
** †Bethanyphyllum depresstum
** †Bethanyphyllum pocillum
** †Bethanyphyllum robustum
** †Bethanyphyllum validum
** †Bethanyphyllum vesiculatum
* †Beyrichoceras
* †Bigalea
** †Bigalea ohioensis – type locality for species
* †Billingsastrea
** †Billingsastrea yandelli
* †Blothrophyllum
** †Blothrophyllum bellicinctum
** †Blothrophyllum corium
** †Blothrophyllum greeni – tentative report
** †Blothrophyllum romingeri – type locality for species
** †Blothrophyllum sinuosum
** †Blothrophyllum tripinnatum
** †Blothrophyllum trisulcatum
** †Blothrophyllum zaphrentiforme
* †Blountia – tentative report
* †Bordonia
** †Bordonia knappi
* †Bothrodendron
** †Bothrodendron minutifolium
* †Botryocrinus
** †Botryocrinus nucleus
** †Botryocrinus polyxo
* †Brachythyris
** †Brachythyris fernglenensis – or unidentified related form
** †Brachythyris suborbicularis
* †Brahmacrinus
** †Brahmacrinus elongatus
* †Brittsia
** †Brittsia problematica
* †Brockocystis
** †Brockocystis nodosaria
* †Bucania
** †Bucania simulatrix – type locality for species
* †Bucanophyllum
** †Bucanophyllum ohioense
* †Bucanopsis
* †Bulimorpha
** †Bulimorpha bulimiformis – type locality for species
** †Bulimorpha elongata – type locality for species
* †Bullimorpha
* Fossil of the Early Ordovician-Silurian trilobite Bumastus †Bumastus
** †Bumastus armatus – or unidentified comparable form
** †Bumastus insignis
** †Bumastus ioxus
** †Bumastus niagarense – or unidentified comparable form
* †Bynumina
* †Byssonychia
** †Byssonychia richmondensis
* †Bythocyproidea
* †Bythopora
** †Bythopora delicatula
** †Bythopora gracilis
** †Bythopora meeki
** †Bythopora striata

## C

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* Fossilized stems from the Carboniferous-Permian horsetail relative Calamites †Calamites
** †Calamites cruciatus
** †Calamites suckowii
* †Calamodendron
** †Calamodendron americanum
* †Calamospora
** †Calamospora breviradiata
** †Calamospora flava
** †Calamospora hartungiana
** †Calamospora liquida
** †Calamospora mutabilis
** †Calamospora straminea
* †Calamostachys
** †Calamostachys paniculata – tentative report
** †Calamostachys superba
** †Calamostachys tuberculata
* †Calceocrinus
* †Calliocrinus
** †Calliocrinus beachleri
** †Calliocrinus cornutus
* †Callipleura
** †Callipleura nobilis
* Fossilized fronds of the Carboniferous seed fern Callipteridium †Callipteridium
** †Callipteridium sullivanti
* †Callistophyton
** †Callistophyton boysettii
* †Callixylon
** †Callixylon brownii
** †Callixylon newberryi
* †Callocystites
** †Callocystites brevis
* †Calocephalites
* †Calostylis
** †Calostylis trigemma – tentative report
* †Calymene
** †Calymene breviceps
** †Calymene celebra
** Fossils in enrolled posture of the Silurian trilobite Calymene niagarensis †Calymene niagarensis
* †Calyptactis
** †Calyptactis confragosus
* †Camarotoechia
** †Camarotoechia gregaria – tentative report
** †Camarotoechia horsfordi
** †Camarotoechia mutata
** †Camarotoechia neglecta – or unidentified comparable form
** †Camarotoechia pisa
** †Camarotoechia tethys
* †Camptocrinus
** †Camptocrinus plenicirrus
* Fossil of the Silurian eurypterid ("sea scorpion") Carcinosoma †Carcinosoma
** †Carcinosoma newlini
* †Cardiocarpon
** †Cardiocarpon annulatum
** †Cardiocarpon dilatatus
** †Cardiocarpon ingens – tentative report
** †Cardiocarpon latealatum
* †Carneyella
* †Carpocrinus
** †Carpocrinus sculptus
* †Carpomanon
* †Caryocrinites
** †Caryocrinites bulbulus
** †Caryocrinites ellipticus
** †Caryocrinites indianensis
** †Caryocrinites laurelensis
** †Caryocrinites sphaeroidalis
** †Caryocrinites stellatus
* Life restoration of the Carboniferous Chimaera relative Caseodus †Caseodus
** †Caseodus eatoni – type locality for species
* †Catazyga
** †Catazyga headi
* †Catillocrinus
** †Catillocrinus turbinatus
** †Catillocrinus wachsmuthi
* †Cavellina
* †Cayrocrinites
* †Cayugaea
** †Cayugaea subcylindrica
* †Cayugea
* †Centronella
** †Centronella campbelli
** †Centronella impressa
** †Centronella navicella
* †Ceramopora
** †Ceramopora imbricata
** †Ceramopora vesicularis
* †Ceramoporella
** †Ceramoporella ohioensis
* †Ceraurinus
** †Ceraurinus icarus
* †Ceraurus
* †Cervifurca – type locality for genus
** †Cervifurca nasuta – type locality for species
* †Chancelloria
* †Charactoceras
** †Charactoceras baeri
** †Charactoceras faberi
* †Cheilocephalus
* Fossil of the Cambrian-Middle Devonian trilobite Cheirurus †Cheirurus
** †Cheirurus dilatatus
* †Chilotrypa
** †Chilotrypa ostiolata
* †Chomatodus
* †Chondrites
* †Chonetes
** †Chonetes geniculatus
** †Chonetes yandellanus
* †Chonophyllum
** †Chonophyllum nanum
* †Chonostegites
** †Chonostegites clappi
** †Chonostegites tabulatus
* †Cincinnaticrinus
* Assemblage of fossilized shells of the Ordovician brachiopod Cincinnetina †Cincinnetina
** †Cincinnetina meeki
** †Cincinnetina multisecta
* †Cingularia
* †Cingulizonates
** †Cingulizonates loricatus
* †Cirratriradites
** †Cirratriradites annulatus
** †Cirratriradites annuliformis
* †Cladochonus
** †Cladochonus beecheri
** †Cladochonus crassus
** †Cladochonus longi
* †Cladopora
** †Cladopora acupicta
** †Cladopora bifurca
** †Cladopora gracilis – tentative report
** †Cladopora gulielmi
** †Cladopora imbricata – tentative report
** †Cladopora robusta – tentative report
** †Cladopora roemeri
* †Cladoxylon
* †Clathrodictyon
* †Clathrospira
** †Clathrospira subconica
* †Cleiodictya
** †Cleiodictya gloriosa
* Fossilized shell of the Middle Devonian-Permian brachiopod Cleiothyridina †Cleiothyridina
** †Cleiothyridina hirsuta
** †Cleiothyridina obmaxima
** †Cleiothyridina parvirostra
** †Cleiothyridina pravirostra
** †Cleiothyridina sublamellosa
* †Cleodictya
* †Clepsidropsis
** †Clepsidropsis titan
* †Clepsydropsis
** †Clepsydropsis bertrandi
** †Clepsydropsis chaneyi
* †Clinopistha
** †Clinopistha exacutus
* †Cliotrypa
* †Clorinda – tentative report
* †Codonotheca
** †Codonotheca caduca
* †Coelocerododontus
** †Coelocerododontus biconvexus – or unidentified comparable form
* †Coelochilina
** †Coelochilina striatomarginata
* †Coeloclema
* †Coelospira
* †Coenites
** †Coenites brownsportensis
** †Coenites cryptodens – or unidentified comparable form
** †Coenites laqueata – or unidentified comparable form
** †Coenites rectilineatus
* †Coleophyllum
** †Coleophyllum romingeri
* †Columnaria
** †Columnaria alveolata
** †Columnaria vacua
* †Complexisporites
** †Complexisporites chalonerii
* Fossilized shell of the Late Devonian-Permian brachiopod Composita †Composita
** †Composita globosa
** †Composita subquadrata
** †Composita sulcata
** †Composita trinuclea
* †Compressiphyllum
** †Compressiphyllum davisana
* †Concavicaris
* †Conchidium
** †Conchidium biolularis – or unidentified comparable form
** †Conchidium exporrecta
** †Conchidium laqueatum
** †Conchidium littoni – or unidentified comparable form
* †Conocardium
** †Conocardium richmondense – type locality for species
* Fossil of the Ordovician bryozoan Constellaria †Constellaria
** †Constellaria limitaris
** †Constellaria polystomella
* †Conularia
** †Conularia formosa
* †Convolutipora
** †Convolutipora florida
* †Convolutispora
** †Convolutispora fromensis
* †Coolinia
** †Coolinia subplana
* †Cordaianthus
** †Cordaianthus gemmifer
* †Cordaicarpon – tentative report
* †Cordaites
** †Cordaites borassifolius
** †Cordaites crassinervis
** †Cordaites principalis
* †Cornulitella
* Fossil of the Middle Ordovician-Carboniferous horn coral Cornulites †Cornulites
** †Cornulites formosa
** †Cornulites proprius
* Cornuspira
** †Cornuspira semiconstrictus
* †Coronura
** †Coronura aspectans
* †Corynotrypa
** †Corynotrypa dissimilis
* †Costalocrinus
** †Costalocrinus rex
* †Costatulites
** †Costatulites richmondensis
* †Cranaena
** †Cranaena lincklaeni
** †Cranaena romingeri
** †Cranaena subcircularis
** †Cranaena sulcata
** †Cranaena sullivanti
* †Crania
** †Crania chesterensis
* †Craniops
** †Craniops hamiltonae
** †Craniops hamiltoniae
* †Crassispora
** †Crassispora kosankei
** †Crassispora plicata
* †Craterophyllum
** †Craterophyllum latiradium – tentative report
** †Craterophyllum magnificum
* †Cribanocrinus
** †Cribanocrinus coxanus
* †Cribroconcha – tentative report
* †Cristatisporites
** †Cristatisporites alpernii
* †Crossotheca
** †Crossotheca sagittata
* Fossilized stem segments of the Silurian crinoid ("sea lily") Crotalocrinites †Crotalocrinites
* †Crotalocrinus
** †Crotalocrinus cora
* †Crurithyris
** †Crurithyris parva
* †Cryptonella
** †Cryptonella lens
** †Cryptonella ovalis
* †Crytobairdia
** †Crytobairdia compacta
* †Ctenocrinus
** †Ctenocrinus granulosus
* †Ctenodonta
** †Ctenodonta iphegenia
** †Ctenodonta madisonensis
* †Cuffeyella
** †Cuffeyella arachnoidea
* †Cunctocrinus
** †Cunctocrinus fortunatus
* †Cuneamya
** †Cuneamya miamiensis
* †Cupularostrum
** †Cupularostrum exima
* †Cupulocorona
** †Cupulocorona gemmiformis
** †Cupulocorona hammeli
** †Cupulocorona osgoodensis
* †Cupulocrinus
** †Cupulocrinus gemmiformis
* †Cyathaxonia
** †Cyathaxonia cyndon
** †Cyathaxonia tantilla
* Fossilized calyx and partial stem of the Silurian-Permian crinoid ("sea lily") Cyathocrinites †Cyathocrinites
** †Cyathocrinites glenni – or unidentified comparable form
** †Cyathocrinites multibrachiatus
** †Cyathocrinites parvibrachiatus
** †Cyathocrinites pauli
** †Cyathocrinites sanduskyensis
** †Cyathocrinites striatissimus
** †Cyathocrinites wilsoni
* †Cyathophyllum – tentative report
* †Cycloconcha
** †Cycloconcha milleri
* †Cyclocyclopa
* †Cyclogranisporites
** †Cyclogranisporites aureus
** †Cyclogranisporites breviradiatus
** †Cyclogranisporites microgranus
** †Cyclogranisporites minutus
** †Cyclogranisporites obliquus
** †Cyclogranisporites orbicularis
** †Cyclogranisporites staplini
* †Cycloholcus
* †Cyclonema
** †Cyclonema bilix
** †Cyclonema daytonensis
** †Cyclonema gyronemoides
** †Cyclonema type locality for species – informal
* †Cyclopentagonopa
* Fossilized foliage from the Carboniferous seed fern Cyclopteris †Cyclopteris
** †Cyclopteris orbicularis
** †Cyclopteris trichomanoides
* †Cyclospongia
** †Cyclospongia discus
* †Cyclotrypa
* †Cylicocrinus
** †Cylicocrinus canaliculatus
** †Cylicocrinus indianensis
** †Cylicocrinus spinosus
* †Cylindrophyllum
** †Cylindrophyllum compactum
* †Cymatonota
** †Cymatonota recta
** †Cymatonota suberecta
* Fossil of the Late Ordovician-Late Devonian trilobite Cyphaspis †Cyphaspis
** †Cyphaspis christyi
* †Cyphocrinus
** †Cyphocrinus gorbyi
* †Cyphotrypa
** †Cyphotrypa osgoodensis
* †Cypricardinia
** †Cypricardinia indenta
** †Cypricardinia scitula
* †Cyrtia
** †Cyrtia exporrecta
* †Cyrtina
** †Cyrtina burlingtonensis
** †Cyrtina hamiltonensis
* †Cyrtocerina
** †Cyrtocerina carinifera
** †Cyrtocerina madisonensis
** †Cyrtocerina modesta
** †Cyrtocerina patella
* †Cyrtodontula
** †Cyrtodontula sterlingensis
* †Cyrtolites
** †Cyrtolites hornyi
** †Cyrtolites ornatus
** †Cyrtolites sinuosus
* Fossilized shells of the Middle-Late Devonian brachiopod Cyrtospirifer †Cyrtospirifer
** †Cyrtospirifer latior
* †Cystelasma
* †Cystihalysites
** †Cystihalysites magnituba
* †Cystiphylloides
** †Cystiphylloides americanum
** †Cystiphylloides cicatriciferum
** †Cystiphylloides hispidum
** †Cystiphylloides infundibuliformis
** †Cystiphylloides nanum
** †Cystiphylloides plicatum
** †Cystiphylloides pustulatum
** †Cystiphylloides quadrangulare
** †Cystiphylloides squamosum
** †Cystiphylloides tenuiradium
* †Cystiphyllum
* †Cystodictya
** †Cystodictya lineata
* †Cytocrinus

## D

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Dalejina
** †Dalejina euorthis
** †Dalejina hybrida
** †Dalejina newsomensis
* Fossil of the Late Ordovician-Middle Devonian trilobite Dalmanites †Dalmanites
** †Dalmanites halli
** †Dalmanites limulurus
* †Danaea
** †Danaea meccaensis
* †Dawsonoceras
** †Dawsonoceras americanum
** †Dawsonoceras annulatum
* †Decadocrinus
** †Decadocrinus depressus
** †Decadocrinus stellatus – type locality for species
* †Decadorinus
* †Decaschisma
** †Decaschisma pulchellum
* †Decatocrinus
* †Deceptrix
** †Deceptrix albertina
** †Deceptrix decipiens – tentative report
* †Dechenella
** †Dechenella boteroi
** †Dechenella lucasensis
* †Decoroproetus
* †Delicaster
** †Delicaster enigmaticus
* †Dellea
* †Delthyris
** †Delthyris clarksvillensis
* †Deltoidospora
** †Deltoidospora grandis
** †Deltoidospora sphaerotriangula
* †Dendrina – tentative report
* †Dendrocrinus
* †Densosporites
** †Densosporites annulatus
** †Densosporites irregularis
** †Densosporites sphaerotriangularis
** †Densosporites spinifer
** †Densosporites triangularis
* †Desmacriocrinus
** †Desmacriocrinus moreyi
* †Desmidocrinus
** †Desmidocrinus dubius
** †Desmidocrinus laurelianus
* †Devonochonetes
** †Devonochonetes coronatus
** †Devonochonetes fragilis
** †Devonochonetes fragilus
** †Devonochonetes scitulus
* †Diabolirhynchia
** †Diabolirhynchia acinus
* †Diabolorhynchia
** †Diabolorhynchia acinus
* †Diaphorodendron
* †Diaphragmus
** †Diaphragmus fasciculatus
* †Dichocrinus
** †Dichocrinus ficus
** †Dichocrinus simplex
** †Dichocrinus striatus
** †Dichocrinus ulrichi
* †Dichostreblocrinus – type locality for genus
** †Dichostreblocrinus scrobiculus – type locality for species
* †Dicksonites – tentative report
** †Dicksonites pluckeneti
* †Dicoelosia
** †Dicoelosia bilobata
* †Diconularia
* †Dictyoclostus
** †Dictyoclostus inflatus
* †Dictyonema
* †Dictyospongia – tentative report
* †Diedrorynchus
** †Diedrorynchus conalatum
* †Dielasma
** †Dielasma arkansana
** †Dielasma crawfordsvillensis
** †Dielasma crowfordsvillensis
** †Dielasma illinoisense
* †Dielasmella
** †Dielasmella compressa
* †Diestoceras
** †Diestoceras cyrtocerinoides
** †Diestoceras eos
** †Diestoceras indianense
** †Diestoceras pupa
** †Diestoceras reversum – tentative report
** †Diestoceras shideleri
** †Diestoceras shiderleri
** †Diestoceras vasiforme
** †Diestoceras waynesvillense – type locality for species
* †Dimegelasma
* †Dimerocrinites
** †Dimerocrinites carleyi
** †Dimerocrinites inornatus
** †Dimerocrinites occidentalis
* Mounted skull of the Late Devonian placoderm fish Dunkleosteus †Dinicthys
* †Dinobolus
** †Dinobolus conradi – or unidentified comparable form
* †Diplochone
** †Diplochone greenei
* †Diplothmema
** †Diplothmema obtusiloba
* †Diplotrypa
** †Diplotrypa nummiformis
* †Disphyllum
** †Disphyllum cohaerens
** †Disphyllum synaptophylloides – type locality for species
* †Ditoecholasma
** †Ditoecholasma acutiannulatum
* Fossils of the Carboniferous crinoid ("sea lily") Dizygocrinus †Dizygocrinus
** †Dizygocrinus indianaensis
** †Dizygocrinus indianensis
** †Dizygocrinus venustus – or unidentified comparable form
** †Dizygocrinus whitei – or unidentified comparable form
* †Dolatocrinus
** †Dolatocrinus bellarugosus
** †Dolatocrinus bulbaceus
** †Dolatocrinus corporosus
** †Dolatocrinus greeni
* †Dolerorthis
** †Dolerorthis flabellites
** †Dolerorthis interplicata
* †Dorycrinus
** †Dorycrinus gouldi
* †Douvillina
** †Douvillina inaequistriata
* †Drabia – tentative report
* Fossil of the Silurian-Late Devonian eurypterid ("sea scorpion") Drepanopterus †Drepanopterus
* †Drymopora
** †Drymopora fascicularis
** †Drymopora frutectosa
** †Drymopora jacksoni
** †Drymopora procumbens
* †Duncanella
** †Duncanella borealis
* †Dyscritella
* †Dystactospongia
** †Dystactospongia madisonensis

## E

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Ecclimadictyon
** †Ecclimadictyon fastigiatum – or unidentified comparable form
* †Echinoconchus
** †Echinoconchus alternatus
** †Echinoconchus biseriatus
* †Edaphophyllum
** †Edaphophyllum bifurcatum
** †Edaphophyllum bipartitum
* Life restoration of the Late Devonian-Carboniferous Chimaera relative Edestus †Edestus
** †Edestus heinrichi
* †Edmondia
** †Edmondia varsoviensis
* †Elasmonema
** †Elasmonema bellatula
* †Elaterites
** †Elaterites triferens
* †Eldredgeops
** †Eldredgeops rana
* †Elita
** †Elita fimbriata
* †Elvinia
* †Elytron
** †Elytron elimatus
* †Emmonsia
** †Emmonsia amplissima
** †Emmonsia bacula
** †Emmonsia convexa
** †Emmonsia cymosa
** †Emmonsia emmonsi
** †Emmonsia epidermata
** †Emmonsia eximia
** †Emmonsia radiciformis
** †Emmonsia ramosa
** †Emmonsia tuberosa
* †Emperocrinus
** †Emperocrinus indianensis
* Fossil of the Middle Ordovician-Early Devonian trilobite Encrinurus †Encrinurus
** †Encrinurus indianaensis
* †Endosporites
** †Endosporites globiformis
** †Endosporites plicatus
* †Enterolasma
** †Enterolasma caliculum
* †Eocaudia
* Eocaudina
** †Eocaudina marginata
** †Eocaudina mccormacki
* †Eochonetes
** †Eochonetes clarksvillensis
* †Eodictyonella (formerly Dictyonella)
** †Eodictyonella coralifera – or unidentified comparable form
** †Eodictyonella reticulata
* †Eohalysiocrinus
** †Eohalysiocrinus stigmatus
* †Eoparisocrinus
** †Eoparisocrinus siluricus
* †Eoplectodonta
** †Eoplectodonta prolongatus
** †Eoplectodonta transversalis
* †Eoplicanoplia
* †Eospinatrypa
** †Eospinatrypa nodostriata
* †Eospirifer
** †Eospirifer eudora
** †Eospirifer foggi
** †Eospirifer niagarensis
** †Eospirifer radiatus
* †Eotomaria
** †Eotomaria laphami
** †Eotomaria trochoides – type locality for species
* †Eotrochus
** †Eotrochus tenuimarginatus – type locality for species
* †Eratocrinus
** †Eratocrinus salemensis
* Fossilized calyx and partial stem of the Carboniferous crinoid ("sea lily") Eretmocrinus †Eretmocrinus
** †Eretmocrinus cassedayanus – tentative report
** †Eretmocrinus magnificus
* †Eridophyllum
** †Eridophyllum apertum
** †Eridophyllum archiaci
** †Eridophyllum coagulatum
** †Eridophyllum conjunctum
** †Eridophyllum seriale
* †Eridopora
** †Eridopora macrostoma
* †Eridorthis
** †Eridorthis nicklesi
* Fossils (figures 2-10) of the Silurian-Devonian eurypterid ("sea scorpion") Erieopterus †Erieopterus
** †Erieopterus limuloides
* †Eucalyptocrinites
** †Eucalyptocrinites caelatus
** †Eucalyptocrinites crassus
** †Eucalyptocrinites tuberculatus
* †Eucheirocrinus
** †Eucheirocrinus indianensis
* †Euchondria
** †Euchondria grandis – tentative report
* †Euconospira
** †Euconospira conula – type locality for species
** †Euconospira elegantula – type locality for species
* †Eugeneodus – type locality for genus
** †Eugeneodus richardsoni – type locality for species
* †Eumetria
** †Eumetria costata
** †Eumetria marcyi
** †Eumetria vera
** †Eumetria verneuiliana
** †Eumetria verneuliana
* †Eunella
** †Eunella harmonia
* †Eunema
** †Eunema helicteres
* †Eunicites
* †Euomphalopterus
** †Euomphalopterus alatus
* †Eupachycrinus
** †Eupachycrinus boydii
* †Eurychilina
** †Eurychilina striatomarginata
* †Eusphenopteris
* †Euthyrhachis
** †Euthyrhachis indianense
* †Eutrophoceras

## F

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Fabalicypris
* †Fardenia
** †Fardenia subplana
* Fossil of the Late Ordovician-Permian tabulate coral Favosites †Favosites
** †Favosites arbor
** †Favosites baculus
** †Favosites biloculi
** †Favosites clelandi
** †Favosites cristatus
** †Favosites discoideus
** †Favosites favosus
** †Favosites forbesi
** †Favosites forbsei
** †Favosites goodwini
** †Favosites hisingeri
** †Favosites hispidus – or unidentified comparable form
** †Favosites impeditus
** †Favosites mundus
** †Favosites niagarensis
** †Favosites occidentalis
** †Favosites patellatus – type locality for species
** †Favosites pirum
** †Favosites placentus
** †Favosites proximatus
** †Favosites quercus
** †Favosites ramulosus
** †Favosites rotundituba
** †Favosites spinigerus
** †Favosites turbinatus
* †Fayettoceras
** †Fayettoceras thompsoni
* Fossil of the Middle Ordovician-Late Triassic bryozoan ("moss animal") Fenestella †Fenestella
** †Fenestella burlingtonensis
** †Fenestella cestriensis
** †Fenestella exigua
** †Fenestella matheri
* †Fenestralia
* †Ferganella
* †Fimbrispirifer
** †Fimbrispirifer divaricatus
** †Fimbrispirifer venustus
* †Finitiporus
** †Finitiporus boardmani
* †Fistulipora
** †Fistulipora compressa
** †Fistulipora compressus
** †Fistulipora excellens
** †Fistulipora incrustans
** †Fistulipora perdensa
** †Fistulipora promiscua
** †Fistulipora spergenensis
* †Fletcheria
* †Flexaria
** †Flexaria annosa – or unidentified related form
** †Flexaria floydensis
* Front (left) and right side (right) views of an enrolled fossil of the Middle Ordovician-Silurian trilobite Flexicalymene †Flexicalymene
** †Flexicalymene meeki
* †Florinites
** †Florinites antiquus
** †Florinites millotti
** †Florinites similis
** †Florinites visendus
** †Florinites volans
* †Floweria
** †Floweria chemungensis

## G

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Gattendorfia
** †Gattendorfia alteri – type locality for species
* †Gazacrinus
** †Gazacrinus depressus
** †Gazacrinus inornatus
** †Gazacrinus magnus
** †Gazacrinus ventricosus
* †Gennaeocrinus
** †Gennaeocrinus carinatus
* †Gigantopteris
** †Gigantopteris dawsoni
* Fossilized calyx and partial stem of the Devonian-Carboniferous crinoid ("sea lily") Gilbertsocrinus †Gilbertsocrinus
** †Gilbertsocrinus tuberosus
* †Gilliodus
** †Gilliodus orvillei – type locality for species
** †Gilliodus peyeri – type locality for species
* †Girtyella
** †Girtyella brevilobata
** †Girtyella indianensis
* †Girtyspira
** †Girtyspira canaliculata – type locality for species
* †Gissocrinus
* †Glabrocingulum
* Life restoration of the Carboniferous shark Glikmanius †Glikmanius
** †Glikmanius occidentalis
* Glomospira
** †Glomospira articulosa
* †Glyphodeta
** †Glyphodeta terebriformis – type locality for species
* †Glyptambon
** †Glyptambon verrucosus
* †Glyptaster
* †Glyptocrinus
* †Glyptodesma
* †Glyptopora
* †Glyptorthis
** †Glyptorthis insculpta
* Diagram depicting the restored internal anatomy and multiple views of the shell of the Silurian nautiloid cephalopod Gomphoceras †Gomphoceras
** †Gomphoceras projectum
** †Gomphoceras wabashense
* †Gomphocystites
** †Gomphocystites indianensis
* †Gorbyoceras
** †Gorbyoceras crossi
** †Gorbyoceras duncanae
** †Gorbyoceras gorbyi
** †Gorbyoceras hammelli
* †Gosseletina
** †Gosseletina subglobosa – type locality for species
* †Granasporites
** †Granasporites medius
* †Granatocrinus
** †Granatocrinus granulosus – tentative report
* †Granulatisporites
** †Granulatisporites granularis
** †Granulatisporites minutus
** †Granulatisporites pallidus
** †Granulatisporites parvus – or unidentified comparable form
** †Granulatisporites tuberculatus
* †Graphiadactyllis
** †Graphiadactyllis fayettevillensis
** †Graphiadactyllis fernglenesis
** †Graphiadactyllis granopunctatus
* †Graphiadactylloides
** †Graphiadactylloides imopmemsos
** †Graphiadactylloides lineatus – or unidentified related form
** †Graphiadactylloides moridgei
** †Graphiadactylloides unionensis
* †Graphiadactylus
* †Graphosterigma
** †Graphosterigma grammodes
* †Graptodictya
* †Greenops
** †Greenops chilmanae
** †Greenops pleione
* Multiple views of a fossil of the Ordovician horn coral Grewingkia †Grewingkia
** †Grewingkia canadensis
** †Grewingkia rusticum
* †Griffithidella
** †Griffithidella doris
** †Griffithidella welleri
* †Gypidula
** †Gypidula nucleus

## H

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
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* R
* S
* T
* U
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* W
* X
* Y
* Z
* †Hadroblastus
* †Hadrophyllum
** †Hadrophyllum nettelrothi
** †Hadrophyllum orbignyi
* Fossil of the Ordovician bryozoan ("moss animal") Hallopora †Hallopora
** †Hallopora elegantula
** †Hallopora subnodosa
* †Halysiocrinus
** †Halysiocrinus tunicatus
* †Halysites
** †Halysites catenularia
** †Halysites labyrinthicus
** †Halysites microporus
* †Hamburgia
* †Haplistion
** †Haplistion armstrongi
* †Hapsiphyllum
** †Hapsiphyllum cassedayi
* †Harpidella
** †Harpidella christyi
* †Harpidium – tentative report
* †Healdia
* †Hebertella
** †Hebertella alveata
** †Hebertella occidentalis
** †Hebertella sinuata
** †Hebertella subjugata
* †Hedeina
** †Hedeina eudora
* †Hederella
** †Hederella alpenensis
** †Hederella delicatula
** †Hederella filiformis
** †Hederella thedfordensis
* †Helicotoma
** †Helicotoma marginata
* †Heliolites
** †Heliolites megastoma
* Fossil of the Middle Devonian horn coral Heliophyllum †Heliophyllum
** †Heliophyllum agassizi
** †Heliophyllum denticulatum
** †Heliophyllum halli
** †Heliophyllum incrassatum
** †Heliophyllum latericrescens
** †Heliophyllum venatum
** †Heliophyllum verticale
* †Helodus
** †Helodus incisus
* †Helopora
** †Helopora inexpectata
* †Hemitrypa
* †Hennigopora
** †Hennigopora apta
* †Heslerodus
** †Heslerodus divergens
* †Hesperorthis
* †Heteralosia
** †Heteralosia keokuk
* †Heterangium
* †Heterophrentis
** †Heterophrentis annulata
** †Heterophrentis cyathiformis
** †Heterophrentis duplicata
** †Heterophrentis inflata
** †Heterophrentis irregularis
** †Heterophrentis nitida – tentative report
** †Heterophrentis ovalis
** †Heterophrentis prolifica
** †Heterophrentis rafinesqui
** †Heterophrentis simplex
** †Heterophrentis trisutura
* †Heterotrypa
** †Heterotrypa microstigma
** †Heterotrypa perplexa
** †Heterotrypa prolifica
** †Heterotrypa singularis
** †Heterotrypa subramosa
* Fossil of the Devonian colonial rugose coral Hexagonaria, also known as a Petoskey stone †Hexagonaria
** †Hexagonaria bella
** †Hexagonaria cincta
** †Hexagonaria curta
** †Hexagonaria ovoidea
** †Hexagonaria partita
** †Hexagonaria ponderosa
** †Hexagonaria prisma
* †Hexameroceras
** †Hexameroceras cacabiforme
** †Hexameroceras delphicolum
* †Hindella – tentative report
* †Hindia
* †Hippocardia
** †Hippocardia ohioense
* †Hirneacrinus
** †Hirneacrinus cupellaeformis – type locality for species
** †Hirneacrinus perplanus – type locality for species
* †Hiscobeccus
** †Hiscobeccus capax
* †Histocrinus
** †Histocrinus coreyi
** †Histocrinus grandis
** †Histocrinus graphicus
* †Hizemodendron
** †Hizemodendron serratum
* †Hoareicardia
** †Hoareicardia cunea
* †Holcocrinus
** †Holcocrinus nodobrachiatus
* †Holcospermum
* †Holocystites
** †Holocystites abnormalis
** †Holocystites abnormis
** †Holocystites alternatus
** †Holocystites clavus
** †Holocystites faberi – or unidentified comparable form
** †Holocystites ornatus
** †Holocystites ovatus
** †Holocystites parvulus
** †Holocystites perlongus
** †Holocystites scutellatus
** †Holocystites spangleri
** †Holocystites splendens
* Fossilized shells of the Ordovician-Carboniferous sea snail Holopea †Holopea
** †Holopea ampla
* †Holtedahlina
** †Holtedahlina sulcata
* †Homalophyllum
** †Homalophyllum fusiformis
** †Homalophyllum herzeri
** †Homalophyllum ungulum
* †Homocrinus
* †Homoeospira
** †Homoeospira evax
* †Homotrypa
** †Homotrypa alta – or unidentified related form
** †Homotrypa austini – or unidentified comparable form
** †Homotrypa communis
** †Homotrypa flabellaris
** †Homotrypa gelasinosa
** †Homotrypa nodulosa – or unidentified comparable form
** †Homotrypa richmondensis
** †Homotrypa wortheni
* †Homotrypella
* †Hondichnus
** †Hondichnus monroensis
* †Hormotoma
** †Hormotoma gracilis
* †Howellella
** †Howellella crispa
** †Howellella crispus
* †Hydnoangulus – type locality for genus
** †Hydnoangulus quadratus – type locality for species
* †Hydriodictya – tentative report
** †Hydriodictya cyclix
* †Hylodecrinus
** †Hylodecrinus sculptus
†Hyolithes
** †Hyolithes monroensis
* Hyperammina
** †Hyperammina bulbosa
** †Hyperammina casteri
** †Hyperammina constricta
** †Hyperammina gracilenta
** †Hyperammina kentuckyensis
** †Hyperammina rockfordensis
* †Hypergonia
** †Hypergonia attenuata – type locality for species
** †Hypergonia turritella – type locality for species
** †Hypergonia vermicula – type locality for species
* †Hypselocrinus
** †Hypselocrinus hoveyi
** †Hypselocrinus indianensis

## I

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Ichthyorachis
* †Icriodus
** †Icriodus latericrescens
* †Icthyocrinus
** †Icthyocrinus corbis
** †Icthyocrinus subangularis
* †Ildraites
** †Ildraites howelli
* †Illaenoides
* †Illaenus
* †Imbrexia
** †Imbrexia forbesi
** †Imbrexia montgomeryensis
** †Imbrexia mortonana
* †Imitoceras
** †Imitoceras rotatorium
* †Iniopera – type locality for genus
** †Iniopera richardsoni – type locality for species
* Life restoration of the Carboniferous Chimaera relative Iniopteryx †Iniopteryx
** †Iniopteryx rushlaui
* †Inocaulis
* †Intrapora
** †Intrapora irregularis
* †Iocrinus
* †Ischadites
** †Ischadites subturbinatus
** †Ischadites tenuis
* †Ischyrodonta
** †Ischyrodonta decipiens
** †Ischyrodonta ovalis
** †Ischyrodonta truncata
* †Isobuthus
** †Isobuthus pottsvillensis – type locality for species
* †Isochilina
** †Isochilina subnodosa
* †Isorthis
** †Isorthis arcuaria – or unidentified related form
* Fossil of the Middle-Late Ordovician giant trilobite Isotelus. †Isotelus
** †Isotelus gigas
** †Isotelus maximus

## K

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Kallimorphocrinus – type locality for genus
** †Kallimorphocrinus astrus – type locality for species
* †Kalymma
** †Kalymma lirata
* †Karinopteris
* †Kaskia
** †Kaskia chesterensis
* †Kindbladia
* †Kindleoceras
** †Kindleoceras cumingsi
** †Kindleoceras equilaterale
** †Kindleoceras rotundum
* †Kingstonia
* †Kionelasma
** †Kionelasma coarticum
** †Kionelasma conspicuum
** †Kionelasma mammiferum
* Fossilized shells of the Middle Ordovician-Permian nautiloid cephalopod Kionoceras †Kionoceras
** †Kionoceras bellense – or unidentified comparable form
** †Kionoceras cancellatum
** †Kionoceras delphiense
* †Kirkbya
** †Kirkbya fernglenensis
** †Kirkbya keiferi
* †Kirkbyella
** †Kirkbyella annensis
* †Kirkidium
** †Kirkidium knighti – or unidentified comparable form
** †Kirkidium laqueatum
* †Knightites
* †Knoxina
* †Knoxisporites
** †Knoxisporites rotatus
** †Knoxisporites triradiatus
* †Kodonophyllum
** †Kodonophyllum mulleri – or unidentified comparable form
* Life restoration of the Silurian eurypterid ("sea scorpion") Kokomopterus †Kokomopterus
** †Kokomopterus longicaudatus
* †Kosovopeltis

## L

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Labechia
* †Laevigatosporites
** †Laevigatosporites desmoinensis
** †Laevigatosporites desmoinesensis
** †Laevigatosporites globosus
** †Laevigatosporites medius
** †Laevigatosporites minutus
** †Laevigatosporites ovalis
** †Laevigatosporites punctatus
** †Laevigatosporites vulgaris
* †Lambeoceras
** †Lambeoceras richmondense
* †Lampadosocrinus
** †Lampadosocrinus minutus
* †Langepis
** †Langepis campbelli – type locality for species
* †Laurelocrinus
** †Laurelocrinus gibbosus
** †Laurelocrinus paulensis
** †Laurelocrinus spinoradialis
** †Laurelocrinus wilsoni
* †Leangella
* †Lebedictya
** †Lebedictya crinita
* †Lebetocrinus
** †Lebetocrinus grandis
* †Lecanocrinus
** †Lecanocrinus elongatus
** †Lecanocrinus pusillus
* †Lechritochoceras
** †Lechritochoceras desplainense
* †Lecythiocrinus – tentative report
* †Leiorhynchus
** †Leiorhynchus limitare
** †Leiorhynchus quadricostatum
* †Leiotriletes
** †Leiotriletes adnatoides
** †Leiotriletes levis
** †Leiotriletes notatus
* †Leodicites
** †Leodicites imparilis – or unidentified related form
** †Leodicites variedentatus
* †Lepadocystis
* †Leperditia
** †Leperditia caecigena
** †Leperditia caecigenia
* †Lepetopsis
** †Lepetopsis levettei – type locality for species
* †Lepidocarpon
* †Lepidocyclus
** †Lepidocyclus perlamellosum
* Restoration of the Carboniferous-Late Triassic club moss relative Lepidodendron. Eli Heimans (1911). †Lepidodendron
** †Lepidodendron aculeatum
** †Lepidodendron baylense
** †Lepidodendron dichotomum
** †Lepidodendron hickii
** †Lepidodendron lanceolatum – tentative report
** †Lepidodendron latifolium
** †Lepidodendron modulatum
** †Lepidodendron obovatum
** †Lepidodendron ophiurus
** †Lepidodendron vestitum
** †Lepidodendron wortheni
* †Lepidophloios
** †Lepidophloios hallii
** †Lepidophloios laricinus – or unidentified comparable form
* †Lepidophyllum
** †Lepidophyllum longifolium
* †Lepidostrobophyllum
** †Lepidostrobophyllum affine
** †Lepidostrobophyllum ovatifolius
** †Lepidostrobophyllum princeps – or unidentified comparable form
* †Lepidostrobus
** †Lepidostrobus incertus – or unidentified comparable form
** †Lepidostrobus variabilis
* †Leptaena
** †Leptaena convexa
** †Leptaena gibbosa
** †Leptaena rhomboidalis
** †Leptaena richmondensis
* †Leptoconocardium
** †Leptoconocardium catastomum – type locality for species
* †Leptodesma
** †Leptodesma rogersi
* †Leptotrypella
** †Leptotrypella ohioensis
* †Lesueurilla
** †Lesueurilla beloitensis
* †Lichas
** †Lichas breviceps
* †Lichenalia
* †Liljevallospira
* †Limoptera
* Shell of the Cambrian-modern brachiopod Lingula †Lingula
** †Lingula otheri
** †Lingula spatulata
* †Lingulops
* †Linoproductus
** †Linoproductus altonensis
** †Linoproductus pileiformis
* †Linopteris
* †Liospira
** †Liospira micula
** †Liospira obtusa
** †Liospira vitruvia
* †Lissatrypa
* †Litocrinus
* †Llanoaspis – tentative report
* †Lobatopteris
** †Lobatopteris vestita – or unidentified comparable form
* †Lobomelocrinus
** †Lobomelocrinus obconicus
* †Lophoblastus
** †Lophoblastus inopinatus – or unidentified comparable form
* †Lophospira
** †Lophospira milleri
** †Lophospira perangulata
** †Lophospira serrulata
** †Lophospira ventricosa
* †Lophotriletes
** †Lophotriletes commissuralis
** †Lophotriletes pseudaculeatus
** †Lophotriletes rarispinosus
* †Loxonema
* †Lumbriconerites
* †Lumectaster
** †Lumectaster howelli
* †Lunulazona – tentative report
** †Lunulazona springeri
* †Lycospora
** †Lycospora granulata
** †Lycospora micropapillata
** †Lycospora noctuina
** †Lycospora orbicula
** †Lycospora paulula
** †Lycospora pellucida
** †Lycospora punctata
** †Lycospora pusilla
** †Lycospora rotunda
** †Lycospora subjuga
* †Lyginorachis
** †Lyginorachis dineuroides
* †Lyriocrinus
** †Lyriocrinus melissa
* †Lyrodesma
** †Lyrodesma major
* †Lyropora
** †Lyropora devonica
* †Lyroporella
** †Lyroporella divergens
* †Lysocystites
** †Lysocystites sculptus
* †Lytospira
** †Lytospira undulatus

## M

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Macrocrinus
** †Macrocrinus mundulus – tentative report
** †Macrocrinus strotobasilaris
** †Macrocrinus strotobasilarsis
* Macrocypris – tentative report
* †Macrostachya
** †Macrostachya infundibuliformis
* †Macrostylocrinus
** †Macrostylocrinus fasciatus
** †Macrostylocrinus striatus
* †Manicrinus
** †Manicrinus erectus
** †Manicrinus hybocriniformis
* †Manitoulinoceras
** †Manitoulinoceras erraticum
** †Manitoulinoceras gyroforme
** †Manitoulinoceras moderatum
* †Marginatia
** †Marginatia burlingtonensis
** †Marginatia crawfordsvillensis
* †Marginirugus
** †Marginirugus magnus
* †Mariopteris
** †Mariopteris hymenophylloides – tentative report
** †Mariopteris mazoniana
** †Mariopteris muricata
** †Mariopteris nervosa
* †Marsupiocrinus
** †Marsupiocrinus laurelensis
** †Marsupiocrinus pauciornatus
** †Marsupiocrinus turbinatus
* †Martinia
** †Martinia contracta
* †Maurotarion
** †Maurotarion christi
* †Mediospirifer
** †Mediospirifer audaculus
* †Medullosa
* †Meekopora
** †Meekopora eximia
* †Megakozlowskiella
** †Megakozlowskiella sculptilis
* †Megalomphala
** †Megalomphala crassa
* †Megalomus
** †Megalomus canadensis
* †Megastrophia
** †Megastrophia concava
** †Megastrophia profunda
* †Megistocrinus
** †Megistocrinus expansus
* †Melocrinites
** †Melocrinites aequalis
** †Melocrinites oblongus
* †Melonechinus
* †Mendacella
** †Mendacella circulus
* †Meniscophyllum
** †Meniscophyllum minutum
* †Menoeidina
* †Merista
** †Merista nitida
* Illustration (lower right, entry 15) of a fossilized shell in front and side views of the Silurian-Late Devonian brachiopod Meristella †Meristella
** †Meristella nasuta
* †Meristina
** †Meristina maria
** †Meristina rectirostra
** †Meristina rectirostris
* †Merocanites
* †Mesocyridira
** †Mesocyridira bifurcata
** †Mesocyridira flagrocosta
** †Mesocyridira keokuk
** †Mesocyridira pallaensis – or unidentified related form
** †Mesocyridira pellaensis – or unidentified related form
** †Mesocyridira washingtonensis
* †Mesoleptostrophia
* †Mesoneuron
** †Mesoneuron simplex
* †Mesotrypa
* †Metriophyllum
** †Metriophyllum deminutivum
* †Miamoceras
** †Miamoceras shideleri
* †Michelinia
** †Michelinia manucus
* †Microantyx
** †Microantyx botoni – type locality for species
* †Microcheilinella
** †Microcheilinella spinosa
* †Microplasma
* †Microreticulatisporites
** †Microreticulatisporites nobilis
** †Microreticulatisporites sulcatus
* †Mirocheilinella
* †Mixoneura – tentative report
** †Mixoneura jenneyi
* †Modiolopsis
** †Modiolopsis concentrica – tentative report
** †Modiolopsis modiolaris
** †Modiolopsis versaillesensis
* †Modiomorpha
** †Modiomorpha concentrica
* †Monodechenella
** †Monodechenella macrocephala
* †Monomorella
* †Monotrypa
** †Monotrypa benjamini
** †Monotrypa exserta
* †Monotrypella
** †Monotrypella aequalis
* †Mooreisporites
** †Mooreisporites inusitatus
* †Mooreoceras
** †Mooreoceras chouteauense
** †Mooreoceras indianense
* †Mourlonia
* †Mucophyllum
* Fossilized shell of the Devonian brachiopod Mucrospirifer †Mucrospirifer
** †Mucrospirifer mucronatus
** †Mucrospirifer profundus
** †Mucrospirifer prolificus
* †Muensteroceras
** †Muensteroceras oweni
** †Muensteroceras parallelum
* †Mulceodens
** †Mulceodens jaanussoni – or unidentified comparable form
* †Murchisonia
** †Murchisonia laphami
** †Murchisonia subulata
** †Murchisonia vincta – type locality for species
* †Murchisonida
* †Myalina
** †Myalina keokuk
* †Myelodactylus
** †Myelodactylus ammonis
** †Myelodactylus convolutus
* †Mysticocrinus

## N

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
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* R
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* T
* U
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* W
* X
* Y
* Z
* †Natica
** †Natica littonana – type locality for species
* †Naticonema
* Fossilized shell of the Early Devonian – Triassic sea snail Naticopsis †Naticopsis
** †Naticopsis carleyana – type locality for species
** †Naticopsis plebeia
* †Navispira
** †Navispira kennethensis
* †Neilsonia
** †Neilsonia insculpta – type locality for species
* †Nematopora
* †Neolageniocrinus
** †Neolageniocrinus cassidus – type locality for species
* †Neopalaeaster
** †Neopalaeaster crawfordsvillensis
* †Neozaphrentis
* †Nereidavis
* Fossilized frond of the Carboniferous seed fern Neuropteris †Neuropteris
** †Neuropteris fimbriata
** †Neuropteris flexuosa
** †Neuropteris heterophylla
** †Neuropteris macrophylla
** †Neuropteris obliqua
** †Neuropteris ovata
** †Neuropteris rarinervis
** †Neuropteris scheuchzeri
** †Neuropteris tenuifolia
** †Neuropteris violetta
* †Nicklesopora
* †Nikiforovella
* †Nipterocrinus
** †Nipterocrinus monroensis
* †Nucleocrinus
** †Nucleocrinus angularis
* †Nucleospira
** †Nucleospira concentrica – or unidentified comparable form
** †Nucleospira concinna
** †Nucleospira pisiformis
** †Nucleospira rowleyi – or unidentified related form
* †Nucularca
** †Nucularca cingulata
* †Nuculites
* †Nuculopsis
** †Nuculopsis hians

## O

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
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* R
* S
* T
* U
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* W
* X
* Y
* Z
* †Odontophyllum
** †Odontophyllum convergens
* Restoration of the Late Ordovician-Middle Devonian trilobite Odontopleura †Odontopleura – tentative report
* †Odontopteris
** †Odontopteris subcuneata
* †Ohiocrinus
** †Ohiocrinus brauni
* †Oligocarpia
** †Oligocarpia missouriensis
* †Omospira
** †Omospira alexandra – or unidentified comparable form
* †Omphalophloios
** †Omphalophloios wagneri – type locality for species
* †Oncoceras
** †Oncoceras anomalum
** †Oncoceras duncanae
** †Oncoceras exile
** †Oncoceras insuetum
* †Onniella
** †Onniella macerata
* †Onychaster
** †Onychaster flexilis
* Fossil of the Carboniferous crinoid ("sea lily") Onychocrinus †Onychocrinus
** †Onychocrinus exculptus
** †Onychocrinus exsculptus
** †Onychocrinus pulaskiensis
** †Onychocrinus ramulosus
* †Onychopterella
** †Onychopterella kokomoensis
* †Oonoceras
** †Oonoceras fennemani
** †Oonoceras rejuvenatum
** †Oonoceras shideleri
* †Ophiletina
** †Ophiletina sublaxa
* †Opisthoptera
** †Opisthoptera casei
* †Orbiculoidea
** †Orbiculoidea keokuk
** †Orbiculoidea lodiensis
* †Oriostoma
** †Oriostoma globosum – or unidentified comparable form
** †Oriostoma hoyi
* †Ornithoprion – type locality for genus
** †Ornithoprion hertwigi – type locality for species
* Restoration of the Carboniferous-Permian cartilaginous fish Orodus †Orodus
** †Orodus greggi – type locality for species
** †Orodus micropterygius – type locality for species
* †Orthis
** †Orthis biforata
** †Orthis pyramidalis
* †Orthodesma
** †Orthodesma curvatum
* †Orthonybyoceras
** †Orthonybyoceras dyeri
* †Orthonychia
** †Orthonychia conicum
* †Orthopleura
* †Orthostrophia
** †Orthostrophia fissistriata
* †Orthotetes
** †Orthotetes kaskaskiensis
** †Orthotetes keokuk
* †Ortonella
** †Ortonella hainesi
* †Osgoodicystis
** †Osgoodicystis biessetti
** †Osgoodicystis cooperi
** †Osgoodicystis wykoffi
* †Otarion
** †Otarion niagarensis
* †Ovatia
** †Ovatia ovata – tentative report
** †Ovatia ovatus
* †Oxyprora
** †Oxyprora carinatum – type locality for species

## P

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Pachydictya
** †Pachydictya crassa
* †Pachylocrinus
** †Pachylocrinus aequalis
** †Pachylocrinus briareus
** †Pachylocrinus gibsoni
* †Pachytesta
** †Pachytesta vera – or unidentified comparable form
* †Palaeacis
** †Palaeacis enormis
* †Palaeocapulus
** †Palaeocapulus acutirostre
** †Palaeocapulus equilateralis
* †Palaeoconcha
** †Palaeoconcha faberi
* †Palaeoneilo
** †Palaeoneilo sulcatina
** †Palaeoneilo truncata
* †Palaeostachya
** †Palaeostachya elongata
* †Paleofavosites – tentative report
** †Paleofavosites prolificus
* †Paleospora
** †Paleospora fragila
* †Paleostachya
* †Paliphyllum
** †Paliphyllum suecicum brassfieldense
* †Palmatolepis
** †Palmatolepis linguiformis
** †Palmatolepis pseudofoliatus
** †Palmatolepis timorenis
* †Palmatopteris
** †Palmatopteris furcata
* †Paolia – type locality for genus
** †Paolia vetusta – type locality for species
* †Paoliola
** †Paoliola gurleyi – type locality for species
* †Paracolocrinus
** †Paracolocrinus paradoxicus
* †Paraconularia
** †Paraconularia chesterensis – tentative report
** †Paraconularia crawfordsvillensis
* †Paracyclas
** †Paracyclas occidentalis
** †Paracyclas proavia
* †Paradichocrinus
** †Paradichocrinus planus
** †Paradichocrinus polydactylus
* †Paragazacrinus
** †Paragazacrinus rotundus
* †Parallelodon
** †Parallelodon obsoletus – tentative report
** †Parallelodon tenuistriatus
* †Paralycopodites
** †Paralycopodites brevifolius
* †Paraparchites
* Assemblage of the Early-Middle Devonian brachiopod Paraspirifer †Paraspirifer
** †Paraspirifer acuminatus
* †Parazyga
** †Parazyga hirsuta
* †Parichthyocrinus
** †Parichthyocrinus crawfordsvillensis
** †Parichthyocrinus meeki
* †Parisocrinus
** †Parisocrinus crawfordsvillensis
* †Parvohallopora
** †Parvohallopora ramosa
* †Passalocrinus
** †Passalocrinus triangularis
* †Patelliocrinus
** †Patelliocrinus indianensis
** †Patelliocrinus laevis
** †Patelliocrinus ornatus
** †Patelliocrinus rugosus
* †Paulicystis
** †Paulicystis densus
** †Paulicystis sparsus
* †Paulocrinus
** †Paulocrinus biturbinatus
* †Paupospira
** †Paupospira bowdeni
** †Paupospira moorei – type locality for species
** †Paupospira tropidophora
* Fossils of the Late Devonian-Permian fern-like fronds Pecopteris †Pecopteris
** †Pecopteris cisti
** †Pecopteris clintoni
** †Pecopteris miltonii
** †Pecopteris polymorpha
** †Pecopteris pseudovestita – tentative report
** †Pecopteris serpillifolia – tentative report
** †Pecopteris squamosa
* †Pelagiella
* †Pellecrinus
** †Pellecrinus hexadactylus
* †Pemtremites
** †Pemtremites patei
* †Penniretepora
* †Pennsylvanioxylon
** †Pennsylvanioxylon nauertianum
* †Pentacystis
** †Pentacystis gibsoni
** †Pentacystis wykoffi
* †Pentagonia
** †Pentagonia biplicata
* †Pentamerella
** †Pentamerella arata
** †Pentamerella pavilionensis
* †Pentameroceras
** †Pentameroceras cumingsi
* †Pentamerus
** †Pentamerus fornicata
** †Pentamerus oblungus
* †Pentaramicrinus
** †Pentaramicrinus bimagnaramus
* Fossilized theca of the Carboniferous blastoid echinoderm ("sea bud") Pentremites †Pentremites
** †Pentremites abruptus
** †Pentremites angularis
** †Pentremites buttsi
** †Pentremites clavatus
** †Pentremites conoideus
** †Pentremites elegans
** †Pentremites girtyi
** †Pentremites halli
** †Pentremites hambachi
** †Pentremites maccalliei
** †Pentremites okawensis
** †Pentremites patei
** †Pentremites platybasis
** †Pentremites pyramidatus
** †Pentremites pyriformis
** †Pentremites robustus
** †Pentremites springeri
** †Pentremites symmetricus
** †Pentremites tulilpaformis
** †Pentremites tulipaformis
** †Pentremites welleri
* †Pentremitidea – tentative report
** †Pentremitidea approximata
* †Perditocardinia
** †Perditocardinia dubia
* †Periastron
** †Periastron perforatum
** †Periastron reticulatum
* †Pericyclus
* †Periechocrinites
* Fossil of the Silurian-Carboniferous crinoid ("sea lily") Periechocrinus †Periechocrinus
** †Periechocrinus umbrosus
* †Peronopora
** †Peronopora decipiens
* †Petalocrinus
** †Petalocrinus inferior
** †Petalocrinus longus
* †Petigopora
* †Petrocrania
** †Petrocrania scabiosa
* †Phacelocrinus
** †Phacelocrinus longidactylus
* Fossil of the Late Ordovician-Late Devonian trilobite Phacops †Phacops
* †Phaenopora
** †Phaenopora ensiformis
* †Phaenoschisma
* †Phanocrinus
** †Phanocrinus formosus
** †Phanocrinus parvaramus
* †Phestia
* †Philhedra
** †Philhedra crenistriata
** †Philhedra laelia
** †Philhedra stewarti
* †Phillipsia
** †Phillipsia bufi
** †Phillipsia bufo
* †Phimocrinus – report made of unidentified related form or using admittedly obsolete nomenclature
* †Pholadomorpha
** †Pholadomorpha pholadiformis
* †Pholidops – report made of unidentified related form or using admittedly obsolete nomenclature
* †Pholidostrophia
** †Pholidostrophia iowaensis
* †Phosphannulus
* †Phractopora
* †Phragmoceras
** †Phragmoceras parvum
* †Phragmodictya
** †Phragmodictya catilliforme
* †Phragmolites
** †Phragmolites dyeri
** †Phragmolites triangularis
* †Phymatophyllum
** †Phymatophyllum multiplicatum
* †Physospongia
** †Physospongia colletti
** †Physospongia dawsoni
* †Pietzschia
** †Pietzschia polyupsilon
* †Pinna
** †Pinna subspatulata
* †Pinnularia
* †Pisocrinus
** †Pisocrinus benedicti – or unidentified comparable form
** †Pisocrinus campana
** †Pisocrinus gemmiformis
** †Pisocrinus gorbyi
** †Pisocrinus quinquelobus
* Fossilized shell of the Ordovician brachiopod Plaesiomys †Plaesiomys
** †Plaesiomys subquadrata
** †Plaesiomys subquatra
* †Planalvus – tentative report
** †Planalvus densa
* †Plasmopora
** †Plasmopora follis
* †Platyaxum
** †Platyaxum alicornis
** †Platyaxum foliatum
** †Platyaxum orthosoleniskum
** †Platyaxum undosum
* Fossilized shell of the Silurian-Early Triassic sea snail Platyceras †Platyceras
** †Platyceras argo – tentative report
** †Platyceras brownsportense
** †Platyceras bucculentum
** †Platyceras clintonensis
** †Platyceras cornutum – or unidentified comparable form
** †Platyceras crassum
** †Platyceras daytonense
** †Platyceras echinatum
** †Platyceras erectum
** †Platyceras lineatum
** †Platyceras niagarense
** †Platyceras niagarensis
** †Platyceras plebium
* †Platycrinites
** †Platycrinites bonoensis
** †Platycrinites hemispericus
** †Platycrinites hemisphericus
** †Platycrinites nodostriatus
** †Platycrinites saffordi
** †Platycrinites safordi
* †Platycrinus
* †Platyrachella
** †Platyrachella macbridei
** †Platyrachella oweni
* Fossilized shell of the Middle Ordovician-Silurian brachiopod Platystrophia †Platystrophia
** †Platystrophia acutilirata
** †Platystrophia annieana
** †Platystrophia attenuata
** †Platystrophia biforata – or unidentified comparable form
** †Platystrophia clarksvillensis
** †Platystrophia cummingsi
** †Platystrophia cypha
** †Platystrophia daytonensis
** †Platystrophia elkhornensis
** †Platystrophia foerstei
** †Platystrophia hopensis
** †Platystrophia laticosta
** †Platystrophia moritura
** †Platystrophia ponderosa
* †Platyzona
** †Platyzona trilineata – type locality for species
* †Pleapopleurus
** †Pleapopleurus tenuicostatus
** †Pleapopleurus tenuicostus
* †Pleapopluerus
** †Pleapopluerus tenuicostatus – tentative report
* †Plectatrypa
* †Plectodonta
** †Plectodonta elegantula
** †Plectodonta transversalis
* †Plectorthis
** †Plectorthis plicatella
* †Plectospira
** †Plectospira sexplicata
* †Plectospirifer
* †Pleurocornu
** †Pleurocornu amissum – or unidentified comparable form
* Fossil of the Silurian-Carboniferous tabulate coral Pleurodictyum †Pleurodictyum
** †Pleurodictyum cornu
** †Pleurodictyum cylindricum
** †Pleurodictyum insigne
** †Pleurodictyum maximum
** †Pleurodictyum michelinoidea
** †Pleurodictyum papillosa
** †Pleurodictyum planum
** †Pleurodictyum speciosus
** †Pleurodictyum spiculata
** †Pleurodictyum wardi
* †Pleuronotus
** †Pleuronotus decewi
* †Pleurorthoceras
** †Pleurorthoceras clarksvillense
* †Poleumita
** †Poleumita scamnata
* Various conodont elements of Polygnathus †Polygnathus
* †Polypora
** †Polypora corticosa
** †Polypora multispinosa
** †Polypora nodolinearis
* †Polysacos – type locality for genus
** †Polysacos vickersianum – type locality for species
* †Polytryphocycloides
* †Polyxylon
** †Polyxylon elegans
* †Portlockiella
* †Poterioceras – tentative report
* †Poteriocrinites
** †Poteriocrinites amplus – type locality for species
* †Potonieisporites
** †Potonieisporites elegans
* †Prasopora
** †Prasopora hospitalis
* Priscopedatus
* †Prismopora
** †Prismopora serrulata
* †Pristiograptus
** †Pristiograptus jaegeri
* †Probillingsites
* Proboscina
* †Prodromites
** †Prodromites gorbyi
* †Productus
** †Productus cestriensis
** †Productus fasiculatus
* Restoration of the Silurian trilobite Proetus †Proetus
** †Proetus crassimarginatus
** †Proetus folliceps
* †Prolecanites
** †Prolecanites lyoni
* †Prolecythiocrinus
** †Prolecythiocrinus problematicus
* †Promexyele
** †Promexyele bairdi
** †Promexyele peyeri – type locality for species
* †Propora
** †Propora exigua
* †Prosolarium
** †Prosolarium crenulata
* †Protaraea
** †Protaraea richmondensis
* †Protatrypa
** †Protatrypa marginalis
* †Proteonina
** †Proteonina cumberlandiae
* †Protocalamites
** †Protocalamites dorfii
* †Protocanites
* †Protochonetes – tentative report
* †Protokoinoceras
** †Protokoinoceras medullare
* †Protolepidodendron
** †Protolepidodendron microphyllum
* †Protoleptostrophia
** †Protoleptostrophia perplana
* †Protomegastrophia
* †Protoniella
** †Protoniella parva – or unidentified related form
* †Protophragmoceras
** †Protophragmoceras hercules
* †Protosalvinia
** †Protosalvinia rarenna
* Psammosphaera
* Life restoration of the Devonian-Permian tree fern Psaronius. Auguste Faguet (1877). †Psaronius
* †Pseudagnostus
* †Pseudastrorhiza
** †Pseudastrorhiza conica
* †Pseudaviculopecten
** †Pseudaviculopecten indianensis
* †Pseudoatrypa
** †Pseudoatrypa devoniana
* †Pseudobythocypris
* †Pseudocolpomya
** †Pseudocolpomya elongata
* †Pseudolingula
* †Pseudostrohiza
** †Pseudostrohiza delicata
* †Pseudosyrinx
** †Pseudosyrinx gigas
* †Pseudozygopleura
** †Pseudozygopleura yandellana – type locality for species
* †Psiloconcha
** †Psiloconcha grandis
* †Psilokirkbyella
** †Psilokirkbyella ozarkensis
* Interior and exterior of the shell of a Pteria, or winged oyster †Pteria
* †Pterinea
** †Pterinea brisa
** †Pterinea demissa
* †Pterinopecten
** †Pterinopecten hermes
** †Pterinopecten princeps
* †Pterocephalia
* †Pterotheca
** †Pterotheca expansa
** †Pterotheca intermedia – type locality for species
* †Pterotocrinus
** †Pterotocrinus acutus
** †Pterotocrinus armatus – or unidentified comparable form
** †Pterotocrinus bifurcatus
** †Pterotocrinus birfurcatus
** †Pterotocrinus convexus
** †Pterotocrinus depressus
** †Pterotocrinus lingulaformis
** †Pterotocrinus rugosus
** †Pterotocrinus spatulatus
* Restoration of the Silurian-Middle Devonian eurypterid ("sea scorpion") Pterygotus †Pterygotus
** †Pterygotus ventricosus
* †Ptychocarpus
** †Ptychocarpus unitus
* †Ptychopleurella
* †Ptylopora
* †Punctatisporites
** †Punctatisporites decorus
** †Punctatisporites flavus
** †Punctatisporites glaber
** †Punctatisporites incomptus
** †Punctatisporites minutus
** †Punctatisporites nahannensis
** †Punctatisporites obesus
** †Punctatisporites orbicularis
* †Punctatosporites
** †Punctatosporites minutus
* †Punctospirifer
** †Punctospirifer obtusus
** †Punctospirifer transversus
* †Pustulocystis
** †Pustulocystis ornatissimus
* †Pycnosaccus
** †Pycnosaccus laurelensis

## Q

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Quasillinites
** †Quasillinites diversiformis
* †Quasillites – tentative report
* †Quassilites

## R

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Rafinesquina
** †Rafinesquina alternata
** †Rafinesquina ponderosa
* †Raistrickia
** †Raistrickia breveminens
** †Raistrickia carbondalensis
** †Raistrickia crinita
** †Raistrickia crocea
** †Raistrickia lowellensis
** †Raistrickia subcrinita
** †Raistrickia superba
* †Raphistomina
** †Raphistomina modesta – or unidentified comparable form
* †Rasmussenoceras
** †Rasmussenoceras variable
* †Rectifenestella
** †Rectifenestella tenax
* †Rectobaidia
** †Rectobaidia fragosa – or unidentified related form
* †Reimannia
** †Reimannia indianensis
* †Renalcis – tentative report
* †Renaultia
** †Renaultia chaerophylloides
* Reophax
** †Reophax lachrymosa
* †Resserella
** †Resserella elegantula
** †Resserella waldronensis
* †Reticulariina
** †Reticulariina salemensis
** †Reticulariina spinosa
* †Reticulatisporites
** †Reticulatisporites polygonalis
** †Reticulatisporites reticulatus
* †Reticulitriletes
** †Reticulitriletes falsus
* †Reticulopteris
** †Reticulopteris muensteri
* †Retispira
** †Retispira textilis – type locality for species
* †Retoporina
** †Retoporina striata
* †Retrorsirostra
** †Retrorsirostra carleyi
* †Retzia
** †Retzia raricosta
* †Rhabdocarpus
** †Rhabdocarpus mamillatus
** †Rhabdocarpus mansfieldi – or unidentified comparable form
** †Rhabdocarpus multistriatus
* †Rhabdomeson
* †Rhadinichthys
* †Rhegmaphyllum – tentative report
** †Rhegmaphyllum daytonensis
* †Rhineoderma
** †Rhineoderma nodulostriata – type locality for species
** †Rhineoderma wortheni – type locality for species
* †Rhinidictya
* †Rhipdomella
** †Rhipdomella perminuta
* †Rhipidium
* †Rhipidomella
** †Rhipidomella hybrida
** †Rhipidomella missouriensis
** †Rhipidomella penelope
** †Rhipidomella perminuta
** †Rhipidomella tenuicosta – or unidentified comparable form
** †Rhipidomella vanuxemi
* †Rhipidothyris
* †Rhombopora
** †Rhombopora simplex
* †Rhombotrypa
** †Rhombotrypa quadrata
* Fossilized shell of the Silurian-Eocene articulate brachiopod Rhynchonella †Rhynchonella
** †Rhynchonella gainesi
** †Rhynchonella scobina
** †Rhynchonella tenuistriata
* †Rhynchopora
** †Rhynchopora beecheri
** †Rhynchopora perryensis – tentative report
** †Rhynchopora rowleyi – tentative report
* †Rhynchotrema
** †Rhynchotrema denatum
** †Rhynchotrema dentatum
* †Rhynchotreta
** †Rhynchotreta americana
* †Rhysocamax
** †Rhysocamax grandis
* †Rhytimya
** †Rhytimya byrnesis
** †Rhytimya mickleboroughi
* †Richmondoceras – type locality for genus
** †Richmondoceras brevicameratum – type locality for species
* †Rineceras
** †Rineceras digonum – tentative report
* †Romingerella
** †Romingerella major – or unidentified comparable form
* †Romingeria
** †Romingeria commutata
** †Romingeria fasciculata
** †Romingeria umbellifera
** †Romingeria uva
* †Ropalonaria
* † Rota
* †Rotiphyllum
** †Rotiphyllum calyculum
* †Roundyella
** †Roundyella mopacifa
* †Rugomena
** †Rugomena vetusta
* †Rugosochonetes
** †Rugosochonetes illinoisensis
** †Rugosochonetes planumbona

## S

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Saccocrinus
** †Saccocrinus benedicti
** †Saccocrinus christyi
* †Saccosompsis
** †Saccosompsis poterium
* †Saffordotaxis
* †Salpingostoma
** †Salpingostoma buelli
** †Salpingostoma richmondense
* †Samaropsis
** †Samaropsis crampii – or unidentified comparable form
* †Sandalodus
* †Sanguinolites
** †Sanguinolites herricki – tentative report
** †Sanguinolites tropidophorus
* †Sapphicorhynchus
** †Sapphicorhynchus sappho
* †Sarocrinus
** †Sarocrinus nitidus
* †Savitrisporites
** †Savitrisporites nux
* †Scalarituba
** †Scalarituba missouriensis
* †Scalites
** †Scalites richmondensis
* †Scenophyllum
** †Scenophyllum conigerum
* †Schellwienella
** †Schellwienella ulrichi
* †Schizobolus
** †Schizobolus concentricus
* †Schizonema – tentative report
* †Schizophoria
* †Schlotheimophyllum
** †Schlotheimophyllum typicum
* †Schoenaster
** †Schoenaster fimbriatus
* †Schopfites
** †Schopfites colchesterensis
** †Schopfites dimorphus
* †Schuchertella
** †Schuchertella costatula
** †Schuchertella lens – tentative report
** †Schuchertella subplana
* †Schuchertoceras
** †Schuchertoceras geniculatum
** †Schuchertoceras prolongatum
** †Schuchertoceras rotundum
* †Schulzospora
** †Schulzospora rara
* Fossilized calyx of the Carboniferous crinoid ("sea lily") Scytalocrinus †Scytalocrinus
** †Scytalocrinus decadactylus
** †Scytalocrinus disparilis – or unidentified comparable form
** †Scytalocrinus robustus
* †Senftenbergia
** †Senftenbergia pennaeformis
* †Septopora
** †Septopora cestriensis
** †Septopora subquadrans
* †Serpulopsis
** †Serpulopsis jacobschapelensis
* †Serpulospira
** †Serpulospira planispira
* †Setigerites
** †Setigerites setiger
** †Setigerites setigerus
* †Shideleroceras
** †Shideleroceras gracile
* †Shivaella
** †Shivaella nicklesi
* †Sibyrhynchus – type locality for genus
** †Sibyrhynchus denisoni – type locality for species
* †Siderella
** †Siderella scotti
* †Sidetes
* †Sievertsia
* Fossilized stump of the Carboniferous-Permian club moss relative Sigillaria †Sigillaria
** †Sigillaria brardii
** †Sigillaria davreuxi
** †Sigillaria kidstoni – tentative report
** †Sigillaria mamillaris – or unidentified comparable form
** †Sigillaria monostigma
** †Sigillaria scutellata
* †Sigillariostrobus
** †Sigillariostrobus quadrangularis
* †Silenites
** †Silenites warei – or unidentified comparable form
* †Sinochonetes
** †Sinochonetes lepidus
* †Sinuites
** †Sinuites cancellatus
** †Sinuites subcompressa
* †Sinuitina
* †Siphonophrentis
** †Siphonophrentis elongata
** †Siphonophrentis planima
** †Siphonophrentis yandelli
* †Skelidorygma
** †Skelidorygma subcardiiformis
* †Skenidioides
* Sorosphaera – tentative report
* †Sowerbyella
** †Sowerbyella rugosa
* †Spackmanites
** †Spackmanites facierugosus – or unidentified comparable form
** †Spackmanites habibii
* †Spathella
** †Spathella illinoiensis
* †Spathiocaris
* †Spathognathodus
** †Spathognathodus snadjri – or unidentified comparable form
* †Spatiopora
* †Sphaerexochus
** †Sphaerexochus romingeri
* †Sphaerirhynchia
** †Sphaerirhynchia stricklandi
* †Sphaerocodium
* †Sphaerocyclus – report made of unidentified related form or using admittedly obsolete nomenclature
** †Sphaerocyclus tuber
* †Sphenophyllostachys
* Fossilized leaves and branches of the Devonian-Triassic horsetail relative Sphenophyllum †Sphenophyllum
** †Sphenophyllum cuneifolium
** †Sphenophyllum emarginatum
** †Sphenophyllum hauchecornei
** †Sphenophyllum myriophyllum
** †Sphenophyllum plurifoliatum
* †Sphenopteris
** †Sphenopteris broadheadi
** †Sphenopteris shatzlarensis
* †Sphenosphaera
** †Sphenosphaera mohri
** †Sphenosphaera subangularis – type locality for species
* †Spinocyrtia
** †Spinocyrtia euryteines
* †Spinozonotriletes
* †Spinulicosta
** †Spinulicosta spinulicosta
* †Spinyplatyceras
** †Spinyplatyceras milleri
* Fossilized shell of the Late Ordovician-Late Triassic brachiopod Spirifer †Spirifer
** †Spirifer angusta
** †Spirifer bifurcatus
** †Spirifer byrnesi
** †Spirifer crawfordsvillensis
** †Spirifer floydensis – tentative report
** †Spirifer fornaculus
** †Spirifer increbescens
** †Spirifer keokuk
** †Spirifer macrus
** †Spirifer montgomeryensis
** †Spirifer mundulus – or unidentified comparable form
** †Spirifer pellaensis – tentative report
** †Spirifer rostellatus
** †Spirifer shepardi – or unidentified related form
** †Spirifer shephardi – or unidentified related form
** †Spirifer tenuicostatus
** †Spirifer tenuimarginatus
** †Spirifer varicosus
** †Spirifer veronensis – or unidentified comparable form
** †Spirifer washingtonensis
* Spiropteris
* Modern shells of the polychaete worm Spirorbis Spirorbis
* †Spiroscala
* †Sporangites
** †Sporangites huronensis
* †Springericrinus
** †Springericrinus doris – tentative report
** †Springericrinus magniventrus – tentative report
* †Spyroceras
** †Spyroceras nuntium
* †Stacheia
** †Stacheia cicatrix
** †Stacheia trepeilopsiformis
* †Staurocephalus
* †Stegerhynchus
** †Stegerhynchus indianense
** †Stegerhynchus indianensis
** †Stegerhynchus neglectum – or unidentified comparable form
** †Stegerhynchus neglectus
** †Stegerhynchus whitii
* †Stelastellara
** †Stelastellara parvula
* †Stelliporella
** †Stelliporella lamellata – or unidentified comparable form
* †Stenoloron
** †Stenoloron swallovana – type locality for species
* †Stenopareia
* †Stenoscisma
** †Stenoscisma explanatum
* †Stephanocrinus
** †Stephanocrinus cornetti
** †Stephanocrinus elongatus
** †Stephanocrinus gemmiformis
** †Stephanocrinus obpyramidalis
** †Stephanocrinus quinquepartitus
* †Stereolasma
** †Stereolasma exile – tentative report
** †Stereolasma parvulum
* †Stethacanthulus – type locality for genus
** †Stethacanthulus longipeniculus – type locality for species
** †Stethacanthulus meccaensis
* Life restorations of a male (foreground) and female (background) of the Late Devonian-Carboniferous Chimaera relative Stethacanthus †Stethacanthus
** †Stethacanthus altonensis
** †Stethacanthus longipeniculus – type locality for species
* †Stictoporina
** †Stictoporina granulifera
* †Stigmaria
** †Stigmaria ficoides
** †Stigmaria wedingtonensis
* †Stigmatella
** †Stigmatella dubia
* †Stinocrinus
* †Stiptocrinus
** †Stiptocrinus benedicti
** †Stiptocrinus howardi
** †Stiptocrinus ornatus
* Stomatopora
* †Straparollus
** †Straparollus planodiscus
** †Straparollus quadrivolvis – type locality for species
** †Straparollus spergenensis – type locality for species
* †Streblotrypa
* †Streblotrypella
* †Streptelasma
** †Streptelasma divaricans
** †Streptelasma vagans
* †Striatopora
** †Striatopora alba – tentative report
** †Striatopora bellistriata
** †Striatopora cavernosa
** †Striatopora flexuosa
* †Stricklandia – tentative report
* †Striispirifer
* †Stromatopora
** †Stromatopora antiqua
* †Stropeodonta
* †Stropheodonta
** †Stropheodonta demissa
* †Strophochonetes
** †Strophochonetes novascotica
* †Strophodonta
** †Strophodonta demissa
* Fossilized shell of the Ordovician-Silurian brachiopod Strophomena †Strophomena
** †Strophomena concordensis
** †Strophomena erratica
** †Strophomena extenuata
** †Strophomena fissicosta
** †Strophomena inequistriata
** †Strophomena neglecta
** †Strophomena nutans
** †Strophomena planoconvexa
** †Strophomena planumbona
** †Strophomena scottensis
** †Strophomena sulcata
** †Strophomena vestusta
* †Strophonella
** †Strophonella semifasciata
** †Strophonella williamsi
* †Strophostylus
** †Strophostylus cyclostomus
* †Styliolina
* †Stylolina
* †Subglobosochonetes
* †Sulcatina
** †Sulcatina sulcata
* †Sulcoretepora
* †Sumixam – type locality for genus
** †Sumixam maximus – type locality for species
* †Sutcliffia
** †Sutcliffia insignis
* †Synbathocrinus
** †Synbathocrinus swallovi
** †Synbathocrinus swallowvi
* †Synchysidendron
** †Synchysidendron resinosum
* Fossil of the Devonian tabulate coral Syringopora †Syringopora
** †Syringopora hisingeri
** †Syringopora monroensis
** †Syringopora perelegans
* †Syringoporida
* †Syringothyris
** †Syringothyris subcuspidatus – or unidentified comparable form
** †Syringothyris textus

## T

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
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* W
* X
* Y
* Z
* †Tabulipora
** †Tabulipora cestriensis
** †Tabulipora ramosa
* †Taeniodictya
* †Tamiobatis
** †Tamiobatis springeri
* †Tasmanites
* Fossil of the Silurian-Carboniferous crinoid ("sea lily") Taxocrinus (right) †Taxocrinus
** †Taxocrinus colletti
** †Taxocrinus ungula – tentative report
* †Tentaculites
** †Tentaculites gracilistriatus
** †Tentaculites sterlingensis
* †Tetradium
** †Tetradium huronense
* †Tetranota
** †Tetranota wisconsinensis
* †Tetrasacculus
** †Tetrasacculus stewarte – tentative report
* †Thalamocrinus
* Fossils of the burrow ichnogenus Thalassinoides †Thalassinoides
* †Thalassoinoides
* †Thamniscus
* †Thamnopora
** †Thamnopora limitaris
* †Thamnoptychia
** †Thamnoptychia alpenensis
** †Thamnoptychia tuberculata – type locality for species
* †Thecia
** †Thecia minor – or unidentified comparable form
* †Thuraminoides
** †Thuraminoides sphaeroidalis
* Thurammina
** †Thurammina arenicorna
** †Thurammina limbata
* †Thuramminoides
** †Thuramminoides sphaeroidalis
* †Thuroholia
** †Thuroholia spicatus – type locality for species
* †Thymospora
** †Thymospora pseudothiessenii
* †Tolypaminna
** †Tolypaminna frizzelli
** †Tolypaminna rotula
* †Tolypammina
** †Tolypammina bransoni
** †Tolypammina bulbosa
** †Tolypammina cyclops
** †Tolypammina gersterensis
** †Tolypammina jacobschapelensis
** †Tolypammina laocoon – or unidentified related form
** †Tolypammina rotula
* †Torispora
** †Torispora securis
* †Torynifer
** †Torynifer pseudolineata
** †Torynifer pseudolineatus
** †Torynifer salemensis
** †Torynifer setiger
* †Tremanotus
** †Tremanotus chicagoensis
* †Trematis
** †Trematis millepuntata
** †Trematis millipunctata
* †Trematocystis
** †Trematocystis magniporatus
* †Trematopora
* †Trepeilopsis
** †Trepeilopsis glomospiroides
** †Trepeilopsis recurvidens
** †Trepeilopsis spiralis
* Fossilized shell of the Ordovician nautiloid cephalopod Treptoceras †Treptoceras
** †Treptoceras cincinnatiensis
** †Treptoceras duseri
** †Treptoceras fosteri
** †Treptoceras hitzi
* †Triamara
** †Triamara laevis
** †Triamara tumida
** †Triamara ventricosa – type locality for species
* †Triangulotarbus – type locality for genus
** †Triangulotarbus terrehautensis – type locality for species
* †Tricopelta
** †Tricopelta breviceps
* Fossil of the Cambrian trilobite Tricrepicephalus †Tricrepicephalus
* †Trigonocarpus
* †Trigonoglossa
* †Trimerella
* †Trimerus
** †Trimerus delphinocephalus
* †Trimoceras
** †Trimoceras gilberti
* †Triplesia
** †Triplesia putillus
* †Triquitrites
** †Triquitrites additus
** †Triquitrites bransonii
** †Triquitrites exiguus
** †Triquitrites minutus
** †Triquitrites protensus
** †Triquitrites spinosus
** †Triquitrites subspinosus
* †Trochonema
** †Trochonema madisonense
** †Trochonema umbilicata – or unidentified comparable form
* †Trochophyllum
* †Troosticrinus
** †Troosticrinus sanctipaulensis
* †Trophocrinus
** †Trophocrinus tumidus
* †Tropidocaris
* †Tropidoleptus
** †Tropidoleptus carinatus
* †Tryplasma
** †Tryplasma parva
* †Tubelelloides
** †Tubelelloides longus
* †Tuberculatosporites
** †Tuberculatosporites robustus
* †Tubulelloides
* †Turneropterum – type locality for genus
** †Turneropterum turneri – type locality for species
* †Turrilepas
* †Twenhofelella
** †Twenhofelella waldroni – type locality for species
* †Tylothyris

## U

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Undulabucania
** †Undulabucania gorbyi – type locality for species
* †Unispirifer
** †Unispirifer lateralis
** †Unispirifer rundlensis – or unidentified related form
* †Uperocrinus
** †Uperocrinus apheles

## V

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Valvisporites
* †Vandelooaster
** †Vandelooaster plicatilis
* †Vaurealispongia
** †Vaurealispongia minuta – type locality for species
* †Vermiforichnus
* †Vermiformichnus
* †Verrucosisporites
** †Verrucosisporites microtuberosus
** †Verrucosisporites verrucosus
* †Vesicaspora
** †Vesicaspora wilsonii
* †Vesicasporites
** †Vesicasporites wilsonii
* †Vestispora
** †Vestispora costata
** †Vestispora fenestrata
** †Vestispora foveata
** †Vestispora laevigata
** †Vestispora pseudoreticulata
* †Voiseyella
** †Voiseyella novamexicana
* †Voiseyells
** †Voiseyells novamexicana – or unidentified related form
* †Vorticina
** †Vorticina cyrtolites

## W

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Waltzispora
** †Waltzispora prisca
* †Warsawia
** †Warsawia lateralis
* †Waylandella
** †Waylandella dartyensis
* †Welleroceras
** †Welleroceras liratum
* †Whitfieldella
** †Whitfieldella intermedia
** †Whitfieldella nitida
* †Whitfieldoceras – tentative report
** †Whitfieldoceras casteri
* †Whittleseya
* †Wilsonicrinus
** †Wilsonicrinus discoideus
* †Wilsoniella
** †Wilsoniella saffordi
* †Wilsonites
** †Wilsonites circularis
** †Wilsonites vesicatus
* †Worthenopora
** †Worthenopora spinosa

## X

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Xenocrinus

## Y

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Youngiella – tentative report

## Z

* A
* B
* C
* D
* E
* F
* G
* H
* I
* J
* K
* L
* M
* N
* O
* P
* Q
* R
* S
* T
* U
* V
* W
* X
* Y
* Z
* †Zaphrenthis
** †Zaphrenthis aequus
** †Zaphrenthis phrygia
* †Zeacrinites
** †Zeacrinites doverensis
** †Zeacrinites trapezinatus
** †Zeacrinites wortheni
* †Zittelloceras
** †Zittelloceras hitzi
** †Zittelloceras lentidilatatum
** †Zittelloceras shidleri
* †Zonidiscus
** †Zonidiscus youngi
* Fossil of the feeding trace ichnogenus Zoophycos †Zoophycos
* †Zophocrinus
** †Zophocrinus howardi
* †Zygospira
** †Zygospira modesta